NEUTRON POWDER DIFFRACTION STUDY OF PHASE-SEPARATION IN LA2CUO4+DELTA OXIDIZED IN KMNO4 SOLUTIONS

被引：13
|
作者：
IZUMI, F
KIM, YI
TAKAYAMAMUROMACHI, E
KAMIYAMA, T
机构：
[1] TAEDOK SCI TOWN,KOREA RES INST STANDARDS & SCI,TAEJON 305606,SOUTH KOREA
[2] UNIV TSUKUBA,INST MAT SCI,TSUKUBA,IBARAKI 305,JAPAN
来源：
PHYSICA C | 1994年 / 235卷
关键词：
D O I：
10.1016/0921-4534(94)91645-4
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Three samples of superconducting La2CuO4+delta with delta values of 0.047, 0.073, and 0.132 were prepared by oxidizing La2CuO4 in aqueous solutions of KMnO4 at 50 degrees C. The samples with delta = 0.073 and 0.132 respectively contained 3 and 2 phases with different delta and T-c values as a result of phase separation on exposure to air at room temperature. The crystal structures of the La2CuO4+delta phases in the three samples were studied by time-of-flight neutron powder diffraction. We could successfully determine the lattice and structure parameters of the constituent phases as well as their mass fractions.
引用
收藏
页码：841 / 842
页数：2
相关论文
共 50 条
  • [41] Dc and Ac conductivity of La2CuO4+delta
    Lunkenheimer, P
    Knebel, G
    Pimenov, A
    Emelchenko, GA
    Loidl, A
    ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1996, 99 (04): : 507 - 516
  • [42] STRUCTURAL STUDY OF LA1.93BI0.07CUO4+DELTA BY NEUTRON POWDER DIFFRACTION
    KIM, YI
    IZUMI, F
    KAMIYAMA, T
    TAKEDA, Y
    HIROI, Z
    TAKANO, M
    GOLDSTONE, A
    ONG, E
    SYNTHETIC METALS, 1995, 71 (1-3) : 1629 - 1630
  • [43] Localized hole states in La2CuO4+delta
    Rubin, P
    Sherman, A
    FIZIKA NIZKIKH TEMPERATUR, 1996, 22 (05): : 543 - 546
  • [44] QUESTION OF SUPEROXIDE IN LA2CUO4+DELTA - REPLY
    SHINN, ND
    ROGERS, JW
    SCHIRBER, JE
    PHYSICAL REVIEW B, 1990, 41 (10): : 7241 - 7242
  • [45] SUPERCONDUCTIVITY AND PHASE-SEPARATION IN LA2CUO4+X
    ZAKHAROV, AA
    NIKONOV, AA
    JETP LETTERS, 1994, 60 (05) : 348 - 352
  • [46] DIRECT OXIDATION OF LA2CUO4 IN AN AQUEOUS-SOLUTION OF KMNO4
    TAKAYAMAMUROMACHI, E
    SASAKI, T
    MATSUI, Y
    PHYSICA C, 1993, 207 (1-2): : 97 - 101
  • [47] Crystal structure and superconductivity in La1.95Bi0.05CuO4+δ oxidized by a KMnO4 aqueous solution
    Tohoku Univ, Sendai, Japan
    Physica C: Superconductivity and its Applications, 1996, 256 (3-4): : 253 - 260
  • [48] Synchrotron X-ray diffraction study of phase separation on heating oxidized La2CuO4.103(4):: the stabilization of phase La2CuO4.086(4)
    Rial, C
    Arroyo, E
    Morán, E
    Alario-Franco, MA
    Amador, U
    Ehrenberg, H
    Fuess, H
    PHYSICA C, 1999, 319 (1-2): : 21 - 33
  • [49] PHASE-EQUILIBRIA IN ELECTROCHEMICALLY OXIDIZED LA2CUO4+DELTA - TRANSPORT MEASUREMENTS VERSUS CHEMICAL-ANALYSIS
    ONDONOCASTILLO, S
    MICHEL, CR
    SEFFAR, A
    FONTCUBERTA, J
    CASANPASTOR, N
    PHYSICA C, 1994, 235 : 563 - 564
  • [50] MISCIBILITY GAP IN ELECTROCHEMICALLY OXYGENATED LA2CUO4+DELTA
    RADAELLI, PG
    JORGENSEN, JD
    KLEB, R
    HUNTER, BA
    CHOU, FC
    JOHNSTON, DC
    PHYSICAL REVIEW B, 1994, 49 (09): : 6239 - 6245
12345